Process for the preconcentration of ores by induced measure of the superficial contents |
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| 申请号 | US39874273 | 申请日 | 1973-09-19 | 公开(公告)号 | US3901793A | 公开(公告)日 | 1975-08-26 |
| 申请人 | RECH GEOLOG MINIERE; | 发明人 | BUCHOT PIERRE CHARLES; COHEN-ALLORO RICHARD; ROBERT JEAN-CLAUDE E; | ||||
| 摘要 | The concentration of a desired material in pieces of ore is determined by coating each piece with a fluorescent material that selectively adheres only to the exposed surfaces of the desired material. The pieces are then individually illuminated by ultraviolet radiation to fluoresce the selectively coated material. First photo-multipliers sense the magnitude of the fluorescence and a second photo-multiplier, which detects the shadow of the ore piece, yields an output proportional, after inversion, to the cross-sectional area of the ore piece. The magnitude value is then divided by the area value to indicate the concentration of the desired material in the ore piece, which may serve as a basis for automatically separating the pieces for further treatment. | ||||||
| 权利要求 | 1. IN A PROCESS TO EFFECT A PRECISE PRECONCENTRATION OF SPECIFIC MINERALS DISPOSED ON THE SURFACE OF BLOCK OF ORES, THE SAID ORES BEING WASHED AND SOAKED IN A SELECTIVE COLLECTOR SUBSTANCE ANDA FLUORESCENT MATTER FOR RENDERING FLUORESCENT ANY DESIRED PORTION OF THE ORE DURING IRRANDIATION OF THE BLOCKS OD ORE BY AN ULTRAVIOLET RADIATION SOURCE HAVING A NAROW FREQUENCY BAD, THE BLOCKS OF ORE BEING SORTED AUTOMATICALLT AS A RESULT OFTHE DETECTION OF THE FLUORESCENT RADIATION, THE PROCESS BEING CHARACTERIZED BY THE SELECTIVE ACTION OF THE COLLECTOR SUBSTANCE BEING REINFORCED EITHER DURING THE WASHING OF THE BLOCKS OF ORE BY A WETTING AND SCOURING SUBSTANCE SELECTED FROM AMONG AN INITIAL GROUP OF SPECIFIC SUBSTANCES, OR AFTER THE WASHING OPERATION, WITH OR WITHOUT A WETTING AND SCOURING SUBSTANCE, BY A KNOWN SUBSTANCE ACTING AS AN CTIVATINGOR DEPRESSING SUBSTANCE CHOSEN FROM A SECOND GROUP, THE DETERMINATION OF THE FLUORESCENT RADIATION R EMITTED BY AT LEAST ONE THIRD OF THE SURFACE OF THE IRRADINATED FRAGMENT AS A RESULT OF THE MEASUREMENT OF THE RADIATION OF A FLUORESCENT SCREEN EMITTING AN AMOUNT PROPORTIONAL TO (S-S) WHEREIN S IS A CONSTANT RELATED TO THE SURFACE AREA OF THE SCREEN AND S THE CROSS-SECTIONAL AREA OF THE FRAGMENT, THE CALCULATION OF AN AMOUNT OF SPECIFIED MINERAL AS A FUNCTION OF THE MASS CONTENT OF THE BLOCK THE DISPLAY OF AT LEAST ONE PREDETERMINED MINIMUM CONTENT, THE COMPARISON OF THE CALCULED VALUE OF THE AMOUNT OF SEPCIFIC MINERAL WITH THE DISPLAYED CONTENT, AND THE SELECTION AND SORTING OF THE BLOCKS OF ORES BY THE CALCULATED CONTENT OF WHICH IS LESS OR GREATER THAN THE DISPLAYED CONTENT. 2. A process as claimed in claim 1 wherein the wetting and scouring agents are selected from the group comprising: soda, lime, sodium carbonate, sulphuric acid, hydrofluoric acid, hydrochloric acid, sodium sulphate and sodium chloride associated with sulphonated or alkyl-sulphated anionic compounds, pine oil, terpenic, aromatic or hydroaromatic solvents such as tetraline. 3. A process as claimed in claim 1, wherein, to reinforce the selective action of the collector substance in the separation of sulphides from gangue or veinstone or sulphur-containing ores of copper, lead, zinc, silver, gold, antimony, molybdenum, the wetting and scouring agent comprises one of the following agents: soda, lime, sodium carbonate, sulphuric acid dissolved in 1 - 2 m3 of water, applied at the rate of 500 - 2,500g per ton of ore, followed by use of copper sulphate at the rate of 250 - 500g per ton of ore, this action commencing immediately before or taking place simultaneously with the action of the collector and the fluorescent matter. 4. A process as claimed in claim 1, wherein, to reinforce the selective action of the collector substance in the separation of oxides of copper, lead, zinc from the gangue or veinstone, the wetting and scouring agent selected from the group: lime, sulphuric acid is used at the rate of 2000 - 4000g per ton of ore, followed by the action of sodium sulphide at the rate of 1000 - 4000g per ton of ore, this action taking place immediately before or simultaneously with the action of the collector and the fluorescent matter. 5. A process as claimed in claim 1, wherein, to reinforce the selective action of the collector substance in the separation of feldspars from quartz, the wetting and scouring agent from the group: sulphuric acid, hydrofluoric acid, and is used at the rate of 500 - 1000g per ton of ore in the case of sulphuric acid or at the rate of 500g per ton in the case of hydrofluoric acid. 6. A process as claimed in claim 1, wherein, to reinforce the selective action of the collector substance in the separation of calcite from quartz, the action of a depressant, sodium silicate, is used at the rate of 100 - 250g per ton of ore. 7. A process as claimed in claim 1, wherein, to reinforce the selective action of the collector substance in the separation of barite from quartz or from iron oxide, sodium carbonate is used at the rate of 300 - 1400g per ton of ore as wetting and scouring agent, followed by the application of starch at the rate of 50 -200g per ton of ore as depressant of iron oxide. 8. A process as claimed in claim 1, wherein, to reinforce the selective action of the collector substance in the separation of potash from the gangue or veinstone and sodium chloride, starch is used at the rate of 30 - 200g per ton of ore. 9. A process as claimed in claim 1, wherein, to reinforce the selective action of the collector substance in the separation of quartz from calcite, hydrofluoric acid is used at the rate of 200 - 500g per ton of ore as wetting and scouring substance. 10. A process as claimed in claim 1, wherein the collecting substance is selected from the group: sodium or potassium xanthate, dithiophosphoric acid, mercaptobenzothiazol, amino acetate, oleic acid, sodium oleate, sodium sulphonate, tall-oil: and the fluorescent matter from the group: anthracene, napthacene, pentacene, chrysene, dibenzanthracene, fluoresceine, eosine, erythrosine, rhodamine, primuline, azines, quinine sulphate, esculine. 11. A process as claimed in claim 1, the fluorescent matter of which is composed of 10 - 50g of anthracene dissolved in benzene in saturated solution per ton of ore and the collector of which is respectively for the sulphur-containing ores of copper, lead, zinc, silver, gold, antimony, molybdenum, one of a group consisting of: sodium xanthate, dithiophosphoric acid at the rate of 50 - 500g per ton or ore; for the oxidised ores of copper, lead, zinc, is one of the agents: potassium xanthate, mercaptobenzothiazol at the rate of 300 - 1000g per ton; for feldspaths: amino acetate at the rate of 200 - 600g per ton of ore; for calcite: oleic acid at the rate of 200 - 1000g per ton of ore; for barite one of the agents: sodium oleate, sodium sulphonate, tall-oil at the rate of 200 - 500g per ton; for potassium and quartz: amino acetate at the rate of 200 - 500g per ton of ore. |
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